WO2019026850A1 - Palier et mécanisme de direction - Google Patents

Palier et mécanisme de direction Download PDF

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Publication number
WO2019026850A1
WO2019026850A1 PCT/JP2018/028480 JP2018028480W WO2019026850A1 WO 2019026850 A1 WO2019026850 A1 WO 2019026850A1 JP 2018028480 W JP2018028480 W JP 2018028480W WO 2019026850 A1 WO2019026850 A1 WO 2019026850A1
Authority
WO
WIPO (PCT)
Prior art keywords
bush
main body
slit
rack
bearing
Prior art date
Application number
PCT/JP2018/028480
Other languages
English (en)
Japanese (ja)
Inventor
関根　敏彦
勝紀 斉藤
昇 中川
宏之 菊池
Original Assignee
オイレス工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by オイレス工業株式会社 filed Critical オイレス工業株式会社
Priority to CN201880045826.6A priority Critical patent/CN110869625A/zh
Publication of WO2019026850A1 publication Critical patent/WO2019026850A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/12—Steering gears mechanical of rack-and-pinion type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/02—Sliding-contact bearings
    • F16C25/04—Sliding-contact bearings self-adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/06—Elastic or yielding bearings or bearing supports, for exclusively rotary movement by means of parts of rubber or like materials

Definitions

  • the present invention relates to a bearing, and more particularly to a bearing suitable for a rack bush used in a rack and pinion type steering mechanism.
  • Patent Document 1 describes a rack bush used for a rack and pinion type steering mechanism.
  • the rack bush is accommodated in the cylindrical housing in a state in which axial movement is restricted, and supports the load applied to the rack bar while allowing axial movement of the rack bar,
  • the bearing body is made of synthetic resin, and a plurality of circumferentially arranged slits are formed from the end face along the axial direction, and on its outer peripheral surface, a mounting groove for mounting an elastic ring is formed It is done.
  • the diameter of the bearing main body is reduced by the elastic ring and the plurality of slits, and the rack bar inserted into the bearing main body is tightened.
  • the clearance between the inner peripheral surface of the bearing main body and the outer peripheral surface of the rack bar Can be made zero to prevent the generation of unpleasant noise due to the collision between the inner peripheral surface of the bearing body and the outer peripheral surface of the rack bar.
  • the rotational movement of the steering shaft is achieved by the meshing between the pinion gear formed at the tip of the steering shaft and the rack gear formed on the rack bar. Is converted to linear motion of the rack bar.
  • the tie rods interlocked with the rack bar apply torque to the steering knuckle through the tie rod ends to rotate the tire around the king pins.
  • the reaction force from the tire is input to the rack bar through the steering knuckle, the tie rod end, and the tie rod.
  • the rack bush described in Patent Document 1 since the elastic ring attached to the bearing main body is in contact with the inner peripheral surface of the housing and accommodated in the housing, the rack bush described in Patent Document 1 is opposed to the tire input to the rack bar.
  • the force causes the elastic ring to be compressively deformed and elastically deformed to escape into the slit of the bush main body.
  • the rack bush moves in the housing, and as a result, the time lag from the steering operation to the actual turning of the tire increases, which adversely affects the steering operation feeling.
  • the present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a bearing suitable for a rack bush which can reduce the influence on the feeling of a steering operation.
  • the slits formed inward from the end face are in one area.
  • the plurality of slits are deflected in the circumferential direction so as to be arranged only in a certain slit arrangement area and not arranged in the other area, ie, a slit non-arrangement area.
  • the ratio of the slit non-arrangement region in the circumferential direction of the bush main body is preferably half or less.
  • the bearing of the present invention is Radially telescopic bushing body, An elastic ring mounted on the bush body,
  • the bush body is It has a plurality of slits formed inward from the end face, The plurality of slits are When the bush main body is divided into two areas in the circumferential direction, it is arranged only in the slit arrangement area which is one area, and not in the slit non-arrangement area which is the other area. It is arranged biased.
  • the steering mechanism of the present invention is It is a rack and pinion type steering mechanism,
  • the bearing that supports the load applied to the rack bar while allowing axial movement of the rack bar;
  • a cylindrical housing that accommodates the bearing while constraining axial movement of the bearing.
  • the bearing is A reaction force supporting member, which is an inner peripheral surface of the housing facing the input direction of the reaction force input from the tire to the rack bar through a tie rod connected to the rack bar, the slit non-arrangement area of the bush main body It is housed within the housing so as to face the surface.
  • the slits are arranged only in the slit arrangement area which is one area, and not arranged in the slit non-arrangement area which is the other area.
  • the plurality of slits are deflected in the circumferential direction, and the slit non-arranged area generates the largest reaction force on the inner circumferential surface of the housing which receives the reaction force input from the tire to the rack bar through the tie rods.
  • the elastic ring By mounting the rack bush to the housing so as to face the reaction force supporting surface which is a region including the portion to be bent, the elastic ring is elastically deformed against the reaction force of the tire on the reaction force supporting surface side, and the inside of the slit In this way, the rigidity against the reaction force of the tire can be improved, and the movement of the rack bar within the housing due to the reaction force of the tire can be suppressed. For this reason, the time lag from the steering operation to the actual turning of the tire is reduced. Further, in order to improve the rigidity of the tire against the reaction force, the inner diameter of the elastic ring does not need to be reduced to strengthen the tightening of the rack bar, which does not affect the sliding characteristics of the rack bush. Therefore, according to the present invention, it is possible to provide a bearing suitable for a rack bush which can reduce the influence on the feeling of steering operation.
  • FIG. 1 is a partial cross-sectional view of a portion of a rack and pinion type steering mechanism according to an embodiment of the present invention.
  • 2 (A) and 2 (B) are a front view and a side view of the rack bush 1
  • FIG. 2 (C) is a cross-sectional view of the rack bush 1 taken along line AA of FIG. 2 (B).
  • . 3 (A), 3 (B) and 3 (C) are a front view, a side view and a rear view of the bush main body 2
  • FIG. 3 (D) is a bush main body shown in FIG. 3 (A).
  • FIG. 3 (E) is a cross-sectional view of the bush main body 2 taken along the line CC shown in FIG. 3 (B).
  • FIGS. 4A and 4B are a front view and a side view of the elastic ring 3
  • FIG. 4C is a cross-sectional view of the elastic ring 3 shown in FIG. .
  • FIG. 1 is a partial cross-sectional view of a part of a rack and pinion type steering mechanism according to the present embodiment.
  • the rack and pinion type steering mechanism supports the load applied to the rack bar 5 while allowing the movement of the rack bar 5 in the axial center O direction, and the rack bush 1
  • the cylindrical housing 4 which accommodates the rack bush 1 is provided, restraining the movement of the axial center O direction of the bush 1.
  • FIG. 2 (A) and 2 (B) are a front view and a side view of the rack bush 1
  • FIG. 2 (C) is a cross-sectional view of the rack bush 1 taken along line AA of FIG. 2 (B). .
  • the rack bush 1 includes a bush main body 2 into which the rack bar 5 is inserted, and an elastic ring 3 attached to the bush main body 2.
  • an elastic ring 3 attached to the bush main body 2.
  • one or three or more elastic rings 3 may be attached to the bush main body 2 .
  • FIG. 3 (A), 3 (B) and 3 (C) are a front view, a side view and a rear view of the bush main body 2, and FIG. 3 (D) is a bush main body shown in FIG. 3 (A).
  • FIG. 3 (E) is a cross-sectional view of the bush main body 2 taken along the line CC shown in FIG. 3 (B).
  • the bush main body 2 is formed of a synthetic resin having good sliding characteristics, such as polyacetal resin, polyamide resin, polyethylene resin, etc., and is a cylindrical member which can expand and contract in the radial direction, and is formed on the inner circumferential surface 20 as illustrated.
  • a sliding surface 21 in sliding contact with the outer peripheral surface 50 of the inserted rack bar 5, and a plurality of first slits 25 formed along the axis O direction from one end face 23 to the other end face 24;
  • a plurality of second slits 26 formed along the axial center O direction from the other end face 24 to one end face 23, an engagement convex portion 27 formed on the outer peripheral surface 22, and a circumference on the outer peripheral surface 22
  • a mounting groove 28 formed in the direction for mounting the elastic ring 3.
  • the first slit 25 and the second slit 26 are for deforming the bush main body 2 in the diameter reducing direction, and the bush main body 2 is divided into two semi-cylindrical portions by a virtual plane P including the axial center O In this case, they are alternately arranged at equal intervals in the circumferential direction while being deflected toward one half cylindrical portion.
  • a slit disposition area 280 which is a semi-cylindrical portion in which the first slit 25 and the second slit 26 are disposed, and a semi-cylindrical portion in which the first slit 25 and the second slit 26 are not disposed.
  • the slit non-arranged area 281 which is
  • the engagement convex portion 27 protrudes radially outward from the outer peripheral surface 22 on one end surface 23 side, and an engagement concave portion (not shown) formed to cut off the inner peripheral surface 40 on one end surface 41 of the housing 4 Housed in As a result, the rotation of the rack bush 1 housed in the housing 4 about the axis O is restricted. Further, the ring-shaped lid 6 is attached to the one end surface 41 of the housing 4 in a state in which the engagement convex portion 27 is accommodated in the engagement concave portion of the housing 4. Thereby, the movement of the rack bush 1 accommodated in the housing 4 in the direction of the axis O is restricted (see FIG. 1).
  • FIGS. 4A and 4B are a front view and a side view of the elastic ring 3
  • FIG. 4C is a cross-sectional view of the elastic ring 3 shown in FIG. .
  • the elastic ring 3 is an annular member formed of an elastic body such as a synthetic rubber or a thermoplastic elastomer, and has an inner diameter Ri smaller than the diameter Ra (see FIG. 3) of the groove bottom 29 of the mounting groove 28 of the bush main body 2
  • the outer diameter Re is larger than the inner diameter Rj (see FIG. 1) of the housing 4.
  • the elastic ring 3 biases the bush main body 2 in the diameter reducing direction by mounting in the mounting groove 28 of the bush main body 2. And tighten the rack bar 5 inserted into the bush body 2. Further, since the outer diameter Re of the elastic ring 3 is larger than the inner diameter Rj of the housing 4, when the rack bush 1 is accommodated in the housing 4, the elastic ring 3 is in pressure contact with the inner circumferential surface 40 of the housing 4 and is compressed and deformed. Thereby, the rack bush 1 is fitted with the housing 4.
  • the inner circumferential surface 40 of the housing 4 (housing opposed to the input direction of the reaction force N input to the rack bar 5 from a tire (not shown) via a tie rod (not shown) connected to the rack bar 5)
  • the rack bush 1 having the above-described configuration is configured such that, of the inner circumferential surfaces 40 of No. 4 as a reaction force supporting surface 42, a region including a portion that generates a maximum reaction force with respect to the reaction force N input to the rack bar 5. And positioning by engagement between the engagement convex portion 27 of the bush main body 2 and the engagement concave portion (not shown) of the housing 4 so that the slit non-arranged area 281 of the bush main body 2 faces the reaction force supporting surface 42 There is.
  • the rack bush 1 does not have the slit arrangement region 280 where the first slit 25 and the second slit 26 are arranged, and the first slit 25 and the second slit 26 not arranged in the bush main body 2.
  • a slit non-arranged area 281 is provided, and the rack bush 1 is accommodated in the housing 4 such that the slit non-arranged area 281 faces the reaction force supporting surface 42 of the housing 4.
  • the elastic ring 3 elastically deforms against the reaction force input from the tire to the rack bar 5 via the tie rod, and the inside of the first slit 25 and the second slit 26. Since it is possible to avoid escape to the above, the rigidity against the reaction force of the tire is improved, and the movement of the rack bar 5 in the housing 4 due to the reaction force of the tire can be suppressed. For this reason, the time lag from the steering operation to the actual turning of the tire is reduced.
  • the rack bush 1 capable of reducing the influence on the feeling of the steering operation.
  • the first slit 25 is deflected to one semi-cylindrical portion side.
  • the slit arrangement region 280 and the slit non-arrangement region 281 are substantially equally divided in the circumferential direction.
  • the ratio of the slit arrangement area 280 and the slit non-arrangement area 281 may not be approximately equally divided in the circumferential direction of the bush main body 2.
  • the ratio of the slit non-arranged area 281 in the circumferential direction of the bush main body 2 is preferably half or less.
  • the plurality of first slits 25 formed along the axial center O direction from the one end face 23 toward the other end face 24 in the slit arrangement region 280 of the bush main body 2 and the other A plurality of second slits 26 are formed along the axial center O direction from the end face 24 of the first end face 23 to the one end face 23.
  • the present invention is not limited to this. Only one of the first slit 25 and the second slit 26 may be provided in the slit arrangement region 280 of the bush main body 2.
  • the shape of the bush main body 2 is made cylindrical, it should just be a cylindrical shape which adapts the shape of the rack bar 5 inserted.
  • the rack bush used for the rack and pinion type steering mechanism has been described as an example, but the present invention is not limited to this.
  • the present invention can be widely applied to a bearing that supports the load of an inserted shaft member.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Sliding-Contact Bearings (AREA)
  • Support Of The Bearing (AREA)

Abstract

L'invention concerne un palier approprié pour un coussinet de crémaillère avec lequel un impact sur la sensation d'une opération de direction peut être réduit. Un coussinet (1) de crémaillère est logé à l'intérieur d'un boîtier cylindrique (4) pour supporter une charge appliquée à une barre (5) de crémaillère tout en permettant un mouvement dans la direction d'un axe O de la barre (5) de crémaillère, et est pourvu d'un corps principal (2) de coussinet susceptible de se dilater et de se contracter dans une direction radiale, et d'un anneau élastique (3) ajusté sur le corps principal (2) de coussinet. Le corps principal (2) de coussinet a une pluralité de première et seconde fentes (25, 26) formées dans la direction de l'axe O à partir de surfaces d'extrémité (23, 24) de celui-ci. Les première et seconde fentes 25, 26 sont disposées de manière décalée l'une par rapport à l'autre dans la direction circonférentielle du corps principal (2) de coussinet, et forment dans le corps principal (2) de coussinet une région (280) d'agencement de fentes dans laquelle sont agencées les première et seconde fentes (25, 26), et une région (281) de non-agencement de fentes dans laquelle les première et seconde fentes (25, 26) ne sont pas agencées.
PCT/JP2018/028480 2017-08-02 2018-07-30 Palier et mécanisme de direction WO2019026850A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201880045826.6A CN110869625A (zh) 2017-08-02 2018-07-30 支承件和转向机构

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-150197 2017-08-02
JP2017150197A JP2019027559A (ja) 2017-08-02 2017-08-02 軸受およびステアリング機構

Publications (1)

Publication Number Publication Date
WO2019026850A1 true WO2019026850A1 (fr) 2019-02-07

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PCT/JP2018/028480 WO2019026850A1 (fr) 2017-08-02 2018-07-30 Palier et mécanisme de direction

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CN (1) CN110869625A (fr)
WO (1) WO2019026850A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11548546B2 (en) * 2017-08-03 2023-01-10 Oiles Corporation Bearing and steering mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004331000A (ja) * 2003-05-12 2004-11-25 Nsk Ltd ラック軸支持装置及びラックアンドピニオン式ステアリング装置
JP2013067317A (ja) * 2011-09-26 2013-04-18 Honda Motor Co Ltd ラックアンドピニオン式ステアリングギヤ
JP2015020661A (ja) * 2013-07-22 2015-02-02 株式会社ジェイテクト ラックブッシュ

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4701873B2 (ja) * 2005-06-28 2011-06-15 オイレス工業株式会社 ブッシュ軸受及びそれを用いた自動車のラック−ピニオン式操舵装置
JP4899374B2 (ja) * 2005-08-03 2012-03-21 オイレス工業株式会社 軸受装置及びこれに用いられる滑り軸受
JP5167754B2 (ja) * 2007-10-18 2013-03-21 オイレス工業株式会社 ブッシュ軸受
JP5141339B2 (ja) * 2008-03-31 2013-02-13 オイレス工業株式会社 ブッシュ軸受及びそれを用いた自動車のラック−ピニオン式操舵装置
JP6034812B2 (ja) * 2014-01-23 2016-11-30 株式会社ショーワ ブッシュ軸受の構造

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004331000A (ja) * 2003-05-12 2004-11-25 Nsk Ltd ラック軸支持装置及びラックアンドピニオン式ステアリング装置
JP2013067317A (ja) * 2011-09-26 2013-04-18 Honda Motor Co Ltd ラックアンドピニオン式ステアリングギヤ
JP2015020661A (ja) * 2013-07-22 2015-02-02 株式会社ジェイテクト ラックブッシュ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11548546B2 (en) * 2017-08-03 2023-01-10 Oiles Corporation Bearing and steering mechanism

Also Published As

Publication number Publication date
CN110869625A (zh) 2020-03-06
JP2019027559A (ja) 2019-02-21

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